Power is now generated judging on how much sunlight each panel is receiving and then calculating an output rate. This is a way of scrapping the old output of ranged power which was totally unrealistic.

This new power system also means that adding more power modules will be needed to keep the station running smoothly, each module added will have a power usage stat and will drain from the output.

That doesn't mean that once drained its game over, once you run out of power your station will slowly start loosing systems and the new temperature control will take affect and you will have to fight to keep your character alive throughout the failure until you fix it.